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Segment Reporting - Segment Profit And Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting            
Research and development $ 25,945   $ 20,709   $ 53,731 $ 36,435
General and administrative 9,875   8,094   19,084 16,518
Stock-based compensation expense 4,351   3,451   8,190 6,205
Other income, net 2,768   4,631   6,054 8,853
Net loss (33,052) $ (33,709) (24,172) $ (19,928) (66,761) (44,100)
Single reportable segment            
Segment Reporting            
Stock-based compensation expense 4,351   3,451   8,190 6,205
Consulting and professional services expenses 4,274   4,459   8,278 7,828
Other segment expenses 2,025   1,308   3,767 2,728
Other income, net (2,768)   (4,631)   (6,054) (8,853)
Net loss 33,052   24,172   66,761 44,100
Single reportable segment | Navenibart            
Segment Reporting            
Research and development 11,082   7,935   22,911 15,071
Single reportable segment | STAR-0310            
Segment Reporting            
Research and development 5,738   5,710   13,174 8,685
Single reportable segment | Employee expenses            
Segment Reporting            
Research and development 4,647   3,195   9,297 6,632
General and administrative 3,330   2,736   6,854 5,598
Single reportable segment | Program support            
Segment Reporting            
General and administrative $ 373   $ 9   $ 344 $ 206